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The transition from gravel to sand bed in Taiwan''s river
often occur in several kilometers. So studying the bed
evolution such as these, the effect of non-uniform suspended
load transport should be considered. The purpose of this study
is by solving suspended load concentration convective-diffusion
equations to get suspended load transport rate of main channel
and flood plains to develop a mathematical model of
heterogeneous bed evolution for compound channel and then
discuss the effect of suspended load transport. This
model was applied to simulate the bed evolution of the Tsengwan
Riverbelow Tsengwen Reservoir with and without suspended load
transport. The comparison of the simulation results show
that it is necessary to consider suspended load transport as
the bed material including sand and silt. And the parameters of
the pick-up rate function are also very important for the
resultof the bed simulation. However, more field data to test
the effect of the pick-up rate are necessary.
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